From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from Leyland Motors Ltd. to Rolls-Royce discussing valve inserts and cylinder head issues.
| Identifier | ExFiles\Box 140\3\ scan0229 | |
| Date | 22th November 1938 | |
| 1175 File BY APPOINTMENT TO THE LATE KING GEORGE V.{VIENNA} LEYLAND MOTORS LIMITED. Head Office and Works, Leyland Manufacturers of Motor Vehicles. YOURS Rm{William Robotham - Chief Engineer}/3/R.{Sir Henry Royce} IN REPLY PLEASE QUOTE: OURS VWP/HK.{Col. T. Harker - Sales} Tel: Ext: 97. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY AND NOT TO INDIVIDUALS CUSTOMERS' VEHICLES DRIVEN AT OWNERS RISK ONLY... TELEGRAPHIC ADDRESS: LEYMOTORS, LEYLAND. TELEPHONE: LEYLAND 81400 (16 LINES) LEYLAND, LANCASHIRE. 22nd November, 1938. Dict. 19th. W. A.{Mr Adams} Robotham Esq., Messrs. Rolls-Royce Ltd., D E R B Y. Dear Mr. Robotham, I must apologise for the delay in acknowledging receipt of your letter dated the 12th November, but I have been up at the Scottish Show and only just returned. I was very interested indeed to see your report on the subject of valve inserts and your detailed drawing of screwed-in inserts on P.lll. On your drawing it is stated that the head should be heated to 300 F.{Mr Friese} before screwing the valve seat in position. May I ask whether, in screwing the seat in at this high temperature any distinct pressure is placed on the seat, or whether it is lightly screwed into position and the contraction effect on cooling is looked upon as providing the necessary tightness of the seat? This trouble we have been up against is causing us considerable concern, as we can never say whether a valve is cracked between the valve seats or otherwise, except by assuming that if the head is 'lifted' between the seats there is a crack at the base of the thread. Your report on the U.S.A. visit is very interesting indeed, as it would appear that the Americans can get by with the pushed-in type of insert. Can you advise me as to what type of seating is used with the aluminium head, that is, whether it is | ||